North American Numbers Source-cited · ownership disclosed
Area code
730
In service
United States · since 2023

Southern Illinois (overlay of 618)

Area code 730 is the overlay of area code 618, placed in service July 7, 2023, to relieve projected exhaustion in southern Illinois. It shares 618's exact geography.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Southern Illinois (overlay of 618)
Type
geographic
Status
in service
In service since
2023
Projected exhaust
2040 Q4

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 730 is

Southern Illinois - identical footprint to 618 (Metro East plus deep-southern Illinois).

Communities served wholly or partly by 730:

BellevilleEast St. LouisEdwardsvilleAltonCarbondaleMarionMount VernonCairo

Same footprint as 618 (~126 municipalities); representative subset.

B · Relationships

How it relates to other codes

The codes 730 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Overlay · 2023 618 Southern Illinois (Metro East) 730 overlays 618's geography; completion made all Illinois area codes overlays.
What's changing. Active overlay of 618 since July 7, 2023.
C · History

How 730 got here

2022-12-07
ICC announced the 730 overlay of the 618 region.
Source: Illinois Commerce Commission press release
2023-07-07
Area code 730 placed in service as the overlay of 618.
Source: Illinois Commerce Commission press release
D · Capacity

How full it is

Prefixes assigned
142
Prefixes available
658
Thousands-blocks assigned
858

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 730 with another code →
Sources
Wikipedia ↗
Area codes 618 and 730
Illinois Commerce Commission ↗
New 730 Area Code Coming to the Illinois 618 Area Code Region
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.